Don"t settle for one distortion pedal when you can have 3 built into one stomp box! This pedal will give you the arsenal you need to tear the heads off of your crowd! The Metal Master is a serious distortion stompbox for head banging heavy metal guitarist and not for the faint of heart. The Metal Master lets you select from a wide range of heavy metal distortion sounds. Choosing different distortion sounds on the Metal Master is easy. By turning the Morph knob, you will hear the Metal Master morph from our model of the Boss Metal Zone to a DigiTech Death Metal, and everything in between, from Controlled Feedback to a personalized Tour of Hell. Power Supply: 9V Alkaline Dry Battery Power Consumption: 4.8Watts (w/optional PS200R power supply) Battery Life: Approximately 4 hours (with continuous usage) Dimensions: 4 15/16"(L) x 3 1/8"(W) x 2 1/8"(H) Unit Weight: 1.38 lbs.